WeakRefexample.java

import java.lang.ref.WeakReference;

class exceptions {
    void print() {
        System.out.println("Print method called");
    }
}

public class WeakRefexample {
    public static void main(String[] args) {

        // Strong Reference
        exceptions obj = new exceptions();
        obj.print();

        // Weak Reference has explicit type class[exceptions] of Reference Object[obj]
        WeakReference<exceptions> weak = new WeakReference<>(obj); 

        obj = null;
        exceptions obj1 = weak.get();

        /**
         * 
         * get() function : It returns this reference object's referent.
         * If this reference object has been cleared,
         * either by the program or by the garbage collector,
         * then this method returns null.
         * 
         **/

        obj1.print(); // will call print method and will not throw any exceptions
    }

}